Vehicle Finance Department - Horror trying to change debit order.

Unable to change debit order details. Call center gives an email address that you have to send a letter to giving them permission to change your banking details, BUT the email returns saying the recipients mailbox is full - I've been at this for 3 months, same message every time. Now ABSA, are you going to pay me back the monthly fees for the account I needed to keep open for ONE debit order? No one can help me, call center agents say its protocol to send an email for banking detail changes, but then why does no one monitor the email account? If its full for 3 months in a row it obviously means no one is checking the email. So much for a brand revamp if you cannot keep up with simplest of things.